o-Quinonoid Heterocycles: Synthesis and Crystal Structure of 2,3-Dicyano-5,7-bismethylthieno[3,4-b]pyrazine

Molecules

Eva H. Mørkved¹  Jon A. Beukes² 

[1] Department of Chemistry, Norwegian University of Science and Technology, N-7491 Trondheim, Norway;Department of Physics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway

关键词: Thieno[3;    4-b]pyrazine;    o-quinonoid heterocycles;    pyrazine-dicarbonitrile;    di(1-bromoethyl)pyrazine;    crystal structure;   

DOI  :  10.3390/12081623

来源: mdpi

【 摘 要 】

2,3-Dicyano-5,7-bismethylthieno[3,4-b]pyrazine (5), has been obtained as a minor product from reactions of S-nucleophiles with 5,6-di(1-bromoethyl)pyrazine-2,3-dicarbonitrile (3), or from a condensation of 4-hydroxy-2,5-dimethyl-2,3-dihydrothiophen-3-one (4) with diaminomaleonitrile. The molecular structure of compound 5 has been confirmed by X-ray diffraction. A partial separation of charge causes a donor-acceptor type arrangement of the planar molecules in uniform parallel stacks with an interplanar spacing of 3.334(2) Å at 100 K.

【 授权许可】

Unknown   
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